Patent US3850839A successfully refreshed from Google Patents.
US3850839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of synthesis gas
Assignee: Cogas Development Co
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Filing: 1971-02-11
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Granted: 1974-11-26
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Expires: 1991-02-11
Abstract
Abstract Synthesis gas is prepared by contacting coal derived char particles with steam in a fluid-bed gasifier wherein heat for the endothermic reaction is supplied by passing through the gasifier, a stream of inert pellets heated by contact with hot combustion gases produced by burning the fines collected from the external cyclone of the gasifier.
Inventors
- 👤 L Seglin
- 👤 R Eddinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:08
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/02; C10J3/06; C10J3/12; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0933
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
IN THE PROCESS OF MAKING SYNTHESIS GAS BY THE GASIFICATION OF A CARBONACEOUS SOLID WITH STREAM IN A FLUIDIZED BED, THE IMPROVEMENT OF PROVIDING HEAT TO THE PEOCESS COMPRISING BURNING FINES SEPARATED FROM THE SYNTHESIS GAS STREAM WITHDRAWN FROM ABOVE THE FLUIDIZED BED, CONTACTING THE COMBUSTION GASES FROM THE COMBUSTED FINES WITH PREFORMED INERT REFRACTORY PEBBLES OF SUBSTANTIALLY SPHERICAL SHAPE FOR SUFFICIENT TIME TO HEAT THE PEBBLES, INTRODUCING THE HEATED PEBBLES INTO THE GASIFICATION ZONE, THE PEBBLES BEING OF SUCH SIZE AND SPECIFIC GRAVITY THAT THEY ARE NOT FLUIDIZED WITH THE CARBON IN THE BED AND SINK BY GRAVITY TO THE BOTTOM OF THE GASIFIER, AND CIRCULATING THE PEBBLES OUT OF THE BOTTOM OF THE GASIFIER, AFTER THEY HAVE GIVEN UP HEAT TO THE REACTION TAKING PLACE IN THE GASIFIER, TO BE REHEATED.
Claim 2
Dependent Claim
133 words
IN THE PROCESS OF MAKING SYNTHESIS GAS BY THE GASIFICATION OF A CARBONACEOUS SOLID WITH STREAM IN A FLUIDIZED BED, THE IMPROVEMENT OF PROVIDING HEAT TO THE PEOCESS COMPRISING BURNING FINES SEPARATED FROM THE SYNTHESIS GAS STREAM WITHDRAWN FROM ABOVE THE FLUIDIZED BED, CONTACTING THE COMBUSTION GASES FROM THE COMBUSTED FINES WITH PREFORMED INERT REFRACTORY PEBBLES OF SUBSTANTIALLY SPHERICAL SHAPE FOR SUFFICIENT TIME TO HEAT THE PEBBLES, INTRODUCING THE HEATED PEBBLES INTO THE GASIFICATION ZONE, THE PEBBLES BEING OF SUCH SIZE AND SPECIFIC GRAVITY THAT THEY ARE NOT FLUIDIZED WITH THE CARBON IN THE BED AND SINK BY GRAVITY TO THE BOTTOM OF THE GASIFIER, AND CIRCULATING THE PEBBLES OUT OF THE BOTTOM OF THE GASIFIER, AFTER THEY HAVE GIVEN UP HEAT TO THE REACTION TAKING PLACE IN THE GASIFIER, TO BE REHEATED.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein the pebbles are circulated in a continuous path downward through and out of the lower end of the gasifier and back through the combustion zone of burning fines.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the fines are burned under conditions which convert the ash to molten slag.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the fines are burned in a fluidized bed of recycle pebbles and carbonaceous solids.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein the fines are burned in an entrained type of reactor and wherein the pebbles are transported and heated.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the carbonaceous solid is coal char.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein the refractory pebbles are made from coal ash.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |